Java Examples - Method Overriding

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Problem Description:

How to use method overriding in Inheritance for subclasses ?

Solution:

This example demonstrates the way of method overriding by subclasses with different number and type of parameters.

public class Findareas{
   public static void main (String []agrs){
      Figure f= new Figure(10 , 10);
      Rectangle r= new Rectangle(9 , 5);
      Figure figref;
      figref=f;
      System.out.println("Area is :"+figref.area());
      figref=r;
      System.out.println("Area is :"+figref.area());
   }
}
class Figure{
   double dim1;
   double dim2;
   Figure(double a , double b) {
      dim1=a;
      dim2=b;
   }
   Double area() {
      System.out.println("Inside area for figure.");
      return(dim1*dim2);
   }
}
class Rectangle extends Figure {
   Rectangle(double a, double b) {
      super(a ,b);
   }
   Double area() {
      System.out.println("Inside area for rectangle.");
      return(dim1*dim2);
   }
}

Result:

The above code sample will produce the following result.

Inside area for figure.
Area is :100.0
Inside area for rectangle.
Area is :45.0


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